Polyethylene Resins do not require chemical additives.

Press Release Summary:

Raprex(TM) pre-processed resins are formulated to provide improved physical properties without chemical cross linking agents. Radiation processing of base PE resin results in inhomogeneous cross link distribution in polymer. This results in parts that are higher in mechanical properties than unmodified versions. Available in extrusion, injection molding, and film grades, products exhibit tear strength from 7.0-13.4 g/micron and tensile strength from 24.2-50.8.

Original Press Release:

Raprex(TM) Pre-Processed Polyethylene Resins Improve Performance Without The Use Of Chemical Additives

SAN DIEGO, CA (December 16, 2003)- IBA (Ion Beam Applications S.A.: Reuters IOBAt.BR and Bloomberg IBAB.BB) announced today that together with its subsidiary IBA Advanced Applications, it has introduced a new family of pre-processed polyethylene resins. Called Raprex(TM), these new resins are formulated to provide improved physical properties without the use of chemical cross linking agents. They offer superior mechanical properties, enhanced design flexibility, reusability, recyclabilitiy and reduced cost.

According to Raprex(TM) product manager George Forczek, "Prior to the introduction of these new resins, the preferred way to improve the physical properties of formed polymer products was to utilize chemicals which imparted a high degree of cross linking. The problem with chemical cross linking, however, is that it ultimately limits the processability and recyclability of the resin in the conversion process. In other words, parts in final form are not recyclable."

With Raprex(TM) resins, however, there is no need for chemical additives. The cross-linking affect is achieved prior to forming the finished parts through radiation processing of the base PE resin. "Because the cross linking effect takes place primarily in the amorphous region of the polymer, the result is an inhomogeneous cross link distribution in the polymer," explains Forczek. "This results in parts that are higher in mechanical properties than their unmodified versions, plus they also are fully recyclable."

Pre-processing of the base PE resin is achieved through a controlled ionizing radiation process as well as other proprietary processes. "It works equally well with High Density, Low Density and Linear Low Density polyethylene resins," adds Forczek.

Raprex(TM) resins are available in three grades for a wide variety of applications. Extrusion grade Raprex(TM) 100 is used for pipe, tubing, containers, and profiles; injection molding grade Raprex(TM) 200 is used for tote bins, pump housings, industrial clamps, and luggage handles; film grade Raprex(TM) 300 is used for steel pipe sleeves, greenhouse film, and timber pole sleeves. Additional applications include bubble packaging and bag applications.

IBA Advanced Applications specializes in the application of radiation processing technologies to industrial products and materials for the purpose of improving product performance and reducing costs. Its parent company, IBA (Ion Beam Applications S.A.), headquartered in Belgium, is an acknowledged world leader in three primary business segments: Technology Services and Equipment, Sterilization and Ionization Services, and Radioisotope Production and Distribution. For more information on Raprex(TM) resins, contact George Forczek at 856.241.8880 extension 108, or visit the website at www.iba-worldwide.com.

Properties of Radiation Modified LLDPE

Property                        Raprex(TM) 300            Raprex(TM) 300

Processed Modified Unprocessed Control

Tensile at yield (MPa) MD 17.7 9.8

Tensile at yield (MPa) TD 14.1 8.2

Tensile strength at break (MPa) MD 50.8 35.4

Tensile strength at break (MPa) TD 46.0 24.2

Elongation at break (%) MD 750 600

Elongation at break (%) TD 790 670

Tear strength (g/micron) MD 12.2 7.0

Tear strength (g/micron) TD 13.4 7.7

Puncture strength (g) 921 481

HDT (°C) 43 43

The above property profiles demonstrate the possible improvements that can be made with Raprex(TM) processing to polyethylene. As demonstrated the process can improve properties such as tensile strength, elongation, tear strength, and puncture resistance. Property profiles may change depending on the base resin being utilized.

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